RSR hubs

r lane · 03-02-2020, 02:05 PM

I am building a widebody car with RSR type center lock hubs. 996 tt brakes, so am having to use 18'' wheels. Trying to figure out how the rotors and wheels are going to fit here. The rotors will have to be custom along with the hats that will mate with the hubs. BBS can provide the wheels and am trying to figure out how they are designed to fit. The hubs have 10 holes in them, 5 at 9.8mm and 5 at 17.3 and they alternate in a circle around the hubs flange. As well as I can tell from pictures, stepped pins go into the smaller hole, and I guess the large hole is just a hole. The pins look to have a slot in them as if they screw into the flange, though the flanges on my hubs have non threaded holes. Anyone with good info on this would you please illuminate me. Thanks, Bob

group911@aol.co · 03-02-2020, 09:23 PM

Only 5 of the holes get used. If your studs are threaded, your flanges need to be threaded

stownsen914 · 03-03-2020, 08:35 AM

I am not familiar with the factory RSR setup, but I have a vintage racecar with centerlocks that use 1980s IndyCar parts. See pic below showing the hubs with drive pins (tried including one of the wheel hub too, but uploads are horrifically slow right now, I'll try again later). On my car, the rotor hats are just sandwiched between the wheel and the hub. I believe the drive pins are threaded onto bolts that poke through the hubs from the inside.

One word of caution on centerlocks. Prep of all the surfaces for flatness and cleanliness is very important to make sure your wheels stay on! They are much more sensitive to this then 5 lug setups. I learned the hard way when a rear wheel nearly exited the car at 150 mph at Watkins Glen. The wheelnuts were torqued carefully, but upon closer inspection I found some burrs that were keeping the brake rotor hat from seating properly, and it was causing the wheelnuts to lose torque as things moved around. I fixed that, and now carefully (maybe a bit anal even) clean the wheel nuts and threads each time they are off, and lightly lube them. And I use safety pins in case a nut comes loose (they go in the holes near the end of the hub snout).

r lane · 03-04-2020, 05:13 AM

Stownsen, thanks for your info. my brake/hub project has taken on a life of its own, maybe more than I can chew. I have figured out the mating of all of this now, just how to fund it all is my next dilemma. Bob

stownsen914 · 03-04-2020, 08:32 AM

If you need custom rotor hats and rotors, consider Coleman Racing. They’ll make you whatever you want, without the Porsche tax. I’ve used Coleman rotors for years on two different racecars and have been happy.

Marc Bixen · Marc Bixen's Garage

r lane, check your PM's.

r lane · 03-06-2020, 04:50 AM

Thanks Marc, I got in touch with Jim. Will call again today when he is back in the store. He is a source for these and I think a lot of RSR pieces. Bob